James de la Rosa prepares for his upcoming clash against dangerous Alfredo Angulo. De la Rosa was working hard by sparring with unbeaten welterweight talent Errol Spence Jr. at Maple Avenue Boxing Gym in Dallas, TX.  De la Rosa will face Angulo at a max weight of 162-pounds in a 10 round featured bout on the Floyd Mayweather vs. Marcos Maidana Showtime Pay-Per-View undercard on September 13th at the MGM Grand in Las Vegas, NV.  Photos by Stacey Verbeek.